Spectral Signature
At one time it was thought that each object had its own spectral signature. This would mean that a birch tree would have one reflectance value and a maple tree would have a totally separate reflectance value.
spectral signature
The pattern of electromagnetic radiation that identifies a chemical or compound. Materials can be distinguished from one another by examining which portions of the spectrum they reflect and absorb. Referenced by: Terra-Care.
The spectral signatures which are produced by this program are "mixed" signatures (see NOTES). Each signature contains one or more subsignatures (represeting subclasses).
The concept of a "spectral signature", another name for a plot of the variations of reflected (or absorbed) EM radiation as function of wavelengths, ...
For example, the spectral signature of visible (to the human eye) light is typically recorded by black-and-white photographic film, ...
"By using imagery acquired simultaneously with the surface data, each surface point possesses an accurate spectral signature assigned to its location, allowing accurate classification of features using conventional remote sensing techniques, ...
Atmospheric windows and sensor placement
Spectral signatures
Detection and Recording
Photographic systems
Imaging systems
Processing and Interpretation
Aerial photos - manual interpretation
Satellite images - digital image processing ...
The objects that are sensed have particular spectral signatures and one has to match the object to the sensor. The simplest and most common device employed by Geographers to carry out remote sensing is aerial photographs.
Solid geometry and statistics were the enabling forces, and after thousands of stochastic interactions, the model would report the spectral signature characteristics a satellite likely would see.
 See also: Image, Class, Cover, Surface, Remote Sensing
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